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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Chemical State Analysis of Entrapped Nitrogen in Carbon Nanohoms Using Soft X-ray Emission and Absorption Spectroscopy
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Chemical State Analysis of Entrapped Nitrogen in Carbon Nanohoms Using Soft X-ray Emission and Absorption Spectroscopy

机译：软X射线发射和吸收光谱法分析碳纳米Nano中截留的氮的化学态

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摘要

The chemical state of nitrogen in nitrogen-entrapped carbon nanohorns (N-CNHs) synthesized by submerged arc discharge in liquid nitrogen was determined by soft X-ray emission and absorption spectroscopy using synchrotron radiation. X-ray absorption spectra (XAS) and X-ray emission spectra (XES) in the CK and NIC regions of the N-CNHs were measured at the Advanced Light Source. From fingerprint analysis in NiC-XAS and by referring to nitrogen-containing aromatic compounds, the suggested chemical state of nitrogen in N-CNHs is imine. Theoretical analysis of NK-XES using the discrete variational Xα molecular orbital calculations elucidated that the local structure of N-CNHs is chemisorption of N2, forming pentagonal and/or hexagonal rings with carbon atoms at the graphitic layer edges, which assume an imine structure. Therefore, the entrapped nitrogen in N-CNHs is chemisorbed at the edges of the graphitic layers.
机译：通过软X射线发射和吸收光谱（使用同步加速器辐射）确定了液氮中通过埋弧放电合成的固氮碳纳米角（N-CNHs）中氮的化学态。在高级光源下测量N-CNH的CK和NIC区域的X射线吸收光谱（XAS）和X射线发射光谱（XES）。根据NiC-XAS中的指纹分析，并通过参考含氮芳族化合物，建议的N-CNHs中氮的化学状态为亚胺。使用离散变分Xα分子轨道计算对NK-XES进行的理论分析表明，N-CNHs的局部结构是N2的化学吸附，在石墨层边缘形成碳原子形成亚胺结构的五边形和/或六边形环。因此，N-CNHs中夹带的氮在石墨层的边缘被化学吸附。

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